gserialized_is_empty()

int gserialized_is_empty

(

const GSERIALIZED *

g

)

Check if a GSERIALIZED is empty without deserializing first.

Only checks if the number of elements of the parent geometry is zero, will not catch collections of empty, eg: GEOMETRYCOLLECTION(POINT EMPTY)

Definition at line 179 of file g_serialized.c.

{
        uint8_t *p = (uint8_t*)g;
        int isempty = 0;
        assert(g);
 
        p += 8; /* Skip varhdr and srid/flags */
        if( FLAGS_GET_BBOX(g->flags) )
                p += gbox_serialized_size(g->flags); /* Skip the box */
 
        gserialized_is_empty_recurse(p, &isempty);
        return isempty;
}

References GSERIALIZED::flags, FLAGS_GET_BBOX, gbox_serialized_size(), and gserialized_is_empty_recurse().

Referenced by boundary(), buffer(), contains(), containsproperly(), convexhull(), coveredby(), covers(), crosses(), disjoint(), geography_bestsrid(), geography_centroid(), geography_distance(), geography_distance_tree(), geography_dwithin(), geography_segmentize(), geos_intersects(), hausdorffdistance(), hausdorffdistancedensify(), is_gserialized_from_datum_empty(), isring(), issimple(), isvalid(), LWGEOM_angle(), LWGEOM_snaptogrid(), LWGEOM_snaptogrid_pointoff(), overlaps(), pgis_union_geometry_array(), postgis_valid_typmod(), ST_DistanceRectTree(), ST_DistanceRectTreeCached(), ST_Equals(), ST_FrechetDistance(), ST_MinimumBoundingCircle(), ST_MinimumBoundingRadius(), test_gserialized_is_empty(), topologypreservesimplify(), and touches().

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